To figure out the kind of exercises, you need to master the definition of each unit. for example

power: watt (W) is

**joule/sec**

Work: is Newton. meter =

**Joule**

To obtain the work done by the adult, we have to convert the power (watt) into a work by multiplying by the time ( * seconds = Joule)

10 minutes is 60 * 10 =

**600 seconds**

200Watt * 600 second = 120000 joules =

**120 Kj**

So the work is 120Kj

So the work is 120Kj